Duplicator



Jan.- 18 1927.

DQ woLFsoN DUPLICATOR 2 Sheets-Sheet l Filed April 9. 1926 20. i if w28 6J Jan. 18,1927.

D, WOLFSON DUPLIGATOR Fi1ed April 9, 1926 2 Sheets-Sheet 2 nl M Nl 0 W la Patented Jan. 18, 1927.

UNITED STATES PATENT OFFlClLI DAVID WOLFSON, 0F FAR ROCKAWAY, NEW YORK.

DUPLICATOR.

Application filed April 9,

My invention relates to duplicators of the class in whicha stencil carrying drum is rolled over a flat bed, on which is placed the material to `be printed.

The invention .resides in the several novel arrangements of parts and in the automatic mechanism, by means of which the drum is made operative or inoperative as it rolls forward and backward over the bed, as well as in the means employed for inking the stencil.

These and various other objects and advantages will be clearly understood from the following description and from the accompanying drawing of a preferred embodiment but itwill be noted that various modifications might be made without departing from the scope of the invention.

ln the drawings:

Fig. 1 is a side elevation of the duplicator.

Fig. 2 is aplan view.

Fig. 3 is a fragmentary side view, shown partly in cross-section.

Fig. 4 is a front view.

Fig. 5 is a cross-sectional side view oflthe drum, showing the inking mechanism.

Figs. 6 and 7 are cross-sectional end views of the drum, showing the inking mechanism in different positions.

Referring now particularlyto Figs. 1, 2 and 4, the duplicator consists of a bed plate 10 supported between the Vside frames 11 and 12, which are provided with yfeet 13, 14, 15 and 16, on which the device rests. A shaft 17 is supported in the side frames near their rear ends and on this shaft the handle operated levers 18 and 19 are rotatingly mounted. These levers are offset towards each other, as plainly shown at 2O and' 21. The drum 22 is rotatingly mount" ed on the sha-ft 23 and it attached, by means of the nuts 24 and 25, to the drum operating levers 26 and 27. These levers, like the handle operated levers 18 and 19, are offset towards each other and all these levers are rotatingly connected on the shaft 28.

A handle 29 is mounted on the shaft 28 between the levers 26 and 27 and coil springsBO and `31 are mounted on this shaft between thelevers 19 and 26 and 18 and 27, respectively. The ends of these springs .are inserted in holes inthe levers, as plainly shown, and their action is such as to vdrawthe pairs of levers towards each other, thus drawing the 'drum rearwardly.

1926. Serial N0. 100,858.

Referring now more particularly to `Fig. 3, it will be noted that the offsets in these levers are such that, when the handle is placed in the position shown in this view, the drum `will be supported as shown. It will also be `noted that the handle operated lever 19 abuts against the stop 32, which is securedon the side frame 11.

In this inoperative position, the drum is held in a fixed relation to the drum operating levers by means of the pin 33, which also rests against one of the levers. The arrangement of the inking device, which is in the interior of the drum and willbe described later, is such as to counterbalance the drum in the position shown Referring again to Figs. 1, 2 and 4, two guide rails 34 and 35 are hinged on the side frames 11 and 12 by means of lugs 36, 37, 38 and 39, formed integral with .the side frames, and lugs 40, 41, 42, and 43, formed integral with the guide rails. The Vrails hinge onpins 44, 45, 46 and 47. i

The construction of these rails is such that they normally rest on the side frames and form a track for the drum when it is moved rearwardly. The front ends' 48 and 49 are curved downwardly so as to raise the ,drum onto the rails, while the rear` ends 5G and 51 are curved outwardly as plainly shown in Fig. 2. The drum 22 is provided with shoulders 52 and 53 which engage with the side rails in the manner now.to beeX- plained.

If .the handle 29 is moved in the directionindicated bythe arrow in Fig.3, the shoulders 52 and 53 will engage respectively with the outwardly curved endsr50 and 51 of the rails 35 and 34 and thus move the rails outward to the position shownon Fig. 4. Vhen the drum reaches the limit of its forward movement and disengages the rails, the rails drop to their normal position. When the `drum is moved rearwardly, the shoulders 52 and 53 engage on the front ends 48 and 49, thus lifting the drum clear of the bed during it-s rearward movement.

The paper to be printed is placed on the bed plate 10 `and is located and held in the correct position by the grip-bar 54, which extends across the bed plate. This gripbar and its operating mechanism is shown on Figs..2 and 3 but, for simplicity, has been omitted from the other views.

A square rocker shaft 55 `is mounted Von trunnions 56 and 57 in the side frames 11 and 12 and is provided with a downwardly and rearwardly extending` lever arm 58 which is engaged by a lever arm 59, formed on the handle operated lever 19, when in the position shown in Fig. 3.

Two square bosses 60 and 61 extend downwardly from the roclrer shaft and are each provided with afhole in which the rods 62 and 63 slide. These rods are connected at their forward ends to the upwardly extending paper guides Gil and 65, which are made integral with the gripbar 5d. Knurled screws 66 and 67 are provided in the lower ends ot the bosses G0 and G1 so that the rods 62 and 63 may be clamped in any desired position. The bed plate 1G is notched at 68 and G9 so as not to interiere with the adjustment of the grip-bar and paper' guides. A tension spring ZO is connected between a pin 7l, attached to the side trarne 11, and a lever arm 72, termed on the roclrer shaft.

Another paper guide, consisting ot a long bar 73, is provided on one Cide of the bed plate and is adjusted by a plurality ot knurled screws 74; which are threaded in the adjacent side Jtraine. rlhis guide is shown only in Figs. 3 and 4t and is used as a marginal guide.

Referring now to Figs. 5, 6 and 7, in which the inlting device is shown, 22 is the drum and 23 the shaft extending therethrough. rl`he drum is ot the well known type, consisting of a perforated shell on which the fabric pad and stencil are stretched, and is provided with a door through which the inlr is applied to the inside of the perforated shell.

ln the presentdevice, a bail consisting of a cross-member 80 and two arms 81 and S2 is rotatably mounted on the shaft 23. The arms 81 and 82 extend beyond the crossmember 8O and carry an inling roll rotating on the trunions Set and 85 inserted in holes provided in the arms. The holes in the arms 81 and 82, through which the shalt 23 passes, are made considerably larger than the diameter ot the shaft and compression springs 86 and 87 are inserted between the cross-members and the shai so as to assure positive engagement of the inlring roll with the shell of the drum. To prevent these springs from buckling, guide pins 8S and 89 are riveted to the cross-member S0. One end of each spring is wound around the shaft 23.

The arm 82 is prolonged and connected by means of the pin 90 to the operating lever 91, which is provided at its other end with the handle 92. Directly under this handle, a notch 93 is provided which locks in a slot 94; in the drum when the inlring roll. engages with the stop 95. ln this position, which is plainly shown in Fig. 7, the whole inking mechanism is securely locked.

Leimen ln Figs. l and 2, a counter 96 is shown. rllhe counter lever 97 is operated each time the lever 18 descends, thus counting the sheets printed.

The duplicator is operated in the following manner:

When it is desired to apply inl( to the drum, a small amount is poured through the door opening 98, the not-ch 93 disengaged from the slot 94; and the inking roll 83 revolved around the shell by manipulating the handle 92, which spreads the ink evenly over the interior ot the shell.

rlhe stack of paper to be printed is placed on the bed plate against the stops Gil, and 73 while the drinn is in the position shown in Fig. 3. is the handle 29 is pulled torward, the grip-bar engages the papers, holding them securely against displacement, and the shoulders 52 and 53 spread the rails 3d and 35 as the drum descends. As the drum passes over the papers, an impression is made on the top sheet, but when the drum is returned, it is -litted clear the papers by the rails now engaging the shoulders ot the drum. rlhe printed sheet is removed and the operation repeated.

llVhile l have described and illustrated a duplicator of the stencil type, it will be readily seen that a hectograph mat may be employed on the drinn in place ot the stencil.

Having thus described my invention, what I claim as new and wish to protect by Letters Patentisl. ln a duplicating device; a trame; a bed plate; a rotatable printing drum; a pair of toggle levers having an operating handle between their central joints and each connected at one end to said trame and at the other end to said drum; and means for alternately lowering and raising said drum as it passes forwardly and reawardly over said bed plate.

2. In a duplicating device; a trame; a bed plate; a rotatable printing drum; a pair of spring actuated toggle levers having an operating handle between their central joints and each connected at one end to said trame and at the other end to said drum; and

means for alternately lowering and raising said drum as it passes forwardly and rearwardly over said bed plate.

3. In a duplicating device; a frame; a rotatable printing drum; a pair of olset toggle levers having an operating handle between their central joints and each connected at one end to said frame and at the other end to said drum; a stop secured on said trame and engaging with one of the said toggle levers; and the oltsets in said toggle levers so formed that, when the said lever engages with said stop, the toggle levers will constitute a stand for supporting said drum in an inoperative position.

4. In a1 duplicating device; a frame; a rotatable printing drum; a pair of oset toggle levers having an operating handle between their central joints and each connected at one end to said frame and at the other end to said drum; a stop secured on said frame and engaging With one of the said toggle levers; oii'sets in said toggle levers so formed that, when the said lever engages With the said stop, the toggle levers Will constitute a stand for supporting the said drum in an inoperative position; and an inking device so located in said drum as to counter-balance it in a predetermined position when in said inoperative position.

5. In a duplicating device; a pair of side frames; a flat bed plate attached to said side frames; a rotatable printing drum; a guide rail hinged to each of said side frames; guide rail engaging shoulders formed at each end of said drum; cam faces formed at each end of said guide rails for alternately loivering and raising said drum on to and up from said bed plate; and means for rolling said drum over said bed plate.

(5. In a duplicating device; a pair of side frames; a rocker shaft pivoted in said side frames; a paper gripping bar, having stops attached thereto, adJustably connected to said rocker shaft; a lever connected to said roel;- er shaft and actuated by the operating mechanism of said duplicatingdevice.

7. In a duplicating device; a rotatable printing drum having a perforated circumference; a panel opening formed longitudinally in the circumference of said drum; means for closing said opening; a shaft passing longitudinally through said drum; a plural armed bail floatingly mounted on said shaft and having an inking roll rotatingly mounted at its outer end; means for holding said inking roll in uniform'contact With the inner surface of said perforated circumference; one of the arms of said bail being prolonged and having an operating lever rotatingly attached thereto; and means for locking said operating lever in an inoperative position.

8. In a duplicating device; a rotatable printing drum having a perforated circums ference; a panel opening formed longitudinally in the circumference of said drum; means for closing said opening; a shaft passing longitudinally through said drum; a plural armed bail floatingly mounted on said shaft and having an inking roll rotatingly mounted at its outer end; spring means for holding said inking roll in uniform contact with the inner surface of said perforated circumference; one of the arms of said bail being prolonged and having an operating lever rotatingly attached thereto; and means for locking said operating lever in an inoperative position whereby the inking device forms a countervveight for said drum.

DAVID WOLFSON. 

